121212345 has 8 divisors (see below), whose sum is σ = 193939776. Its totient is φ = 64646576.

The previous prime is 121212341. The next prime is 121212347. The reversal of 121212345 is 543212121.

121212345 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121212345 - 2² = 121212341 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (121212341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4040397 + ... + 4040426.

It is an arithmetic number, because the mean of its divisors is an integer number (24242472).

Almost surely, 2^121212345 is an apocalyptic number.

121212345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121212345 is a deficient number, since it is larger than the sum of its proper divisors (72727431).

121212345 is an equidigital number, since it uses as much as digits as its factorization.

121212345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8080831.

The product of its digits is 480, while the sum is 21.

The square root of 121212345 is about 11009.6478145307. The cubic root of 121212345 is about 494.8979077280.

Adding to 121212345 its reverse (543212121), we get a palindrome (664424466).

The spelling of 121212345 in words is "one hundred twenty-one million, two hundred twelve thousand, three hundred forty-five".